Screw pump



April 28, 1925. 1,535,415

A. HOLLANDER SCREW PUMP Filed March 27, 1924 INVENTORL Patented Apr. 28,1925.

UNITED STATES PATENT OFFICE.

SCREW PUMP.

Application filed March 27, 1924. Serial No. 702,241.

To all whom it may concern:

Be it known that I, ALADAR HOLLANDER, a citizen of the United States,and resident of the city of Berkeley, county of Alameda, State ofCalifornia, have invented new. and useful Improvements in Screw Pumps,of which the following is a specification.

My invention is particularly applicable to what is known as screw pumpswherein a zone of increased pressure is established on one side by animpeller having blades with an axial pitch and substantially devoid ofradial pitch.

It has heretofore been found that when the resulting increased pressureis exposed to the bearings of the rotating shaft in such a pump it hasbeen difiicult to maintain lubrication because the tendency of the pumpfluid to force its way between the bearin s and shaft.

My invention has for its object the pre vention of the bad effects ofpressure water between the bearings and shaft of such a pump, andsecuring the proper lubrication of said shaft and bearings at all times.

Other objects will appear from the drawings and specifications whichfollow:

These objects I accomplish by employing in the hub of the impeller a.plurality of vanes adapted to force outward by centrifugal action, anywater or fluid which would otherwise find its way into the bearings.

By referring to the accompanying drawings and specifications myinvention will be made clear.

Fig. 1 is a cross section through a vertical type of screw pump to whichmy invention has been applied.

Fig. 2 is a plan view of the screw impeller of Fig. 1 to which myinvention has been applied.

Throughout the ngures similar numerals.

refer to identical parts.

An inlet 'thimble for the pump is shown by the numeral 1, and adischarge outlet is shown at 2. At 3, 4, 5 and 6 are shown blades of theimpeller having any suitable axial pitch adapted to establish therequisite pressure to discharge through the outlet 2 fluid received inthe direction of the arrow 7. At 8 is a running joint between the hub 9of the impeller and the stationary casing member 10, and the water fromthe pressure side of this impeller would, were it not for my invention,find its way into the passage 13. To overcome this tendency of the waterto enter I core out the hub of the impeller, casting therein a pluralityof pump vanes as 14, 15, which function upon the rotation of theimpeller to throw /outwardly and maintain clear of the bearings 11, 13and journals 16, 17, any water from the pressure side of the pump. Theaction of these vanes will be such that there is a partial vacuum formedin the channel 8 whereby lubricant is permitted to slowly advance downthe sleeve 12 finding its way, a drop at a time, and when itslubricating qualities have been expended discharges into the channel 8and thence through the discharge '2. This lubricant may be fed from thecup 20 through the bearing sleeve channel 21 thus maintaining a perfectlubrication of the bearing and journal 13,17 respectively andmaintaining a. supply of lubricant in the sleeve 12 to feed the bearingand journal 11 and 16 respectively as required and during the pumpoperation.

I claim:

In a pump, a-serew type impeller, a shaft adapted to drive saidimpeller, a casing having a bearing for said shaft adjacent thedischarge side of said impeller, an annular pocket having spiral vanestherein in said impeller open on the discharge side and closed on thesuction side of said impeller said casing closing the said open side ofsaid pocket and forming a running joint with the impeller whereby therotation of the impeller establishes a pressure from the pocket andthrough the running joint greater than the pressure of discharge of theimpeller.

- ALADAR HOLLANDER.

